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Yes, you can form 1 a suppressor and build one yourself. You always wait for the the approved paperwork/stamp to come back from the ATF before you start your work.
The problem is a delayed blowback like a Sig requires a recoil booster in the suppressor so it will cycle. I don't know the first thing about how boosters are made.
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"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens
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